Tarzan the Untamed by Edgar Rice Burroughs

The girl was almost crushed by terror and disappointment. To have been thus close to safety and then to have all hope snatched away by a cruel stroke of fate seemed unendurable. The man was disappointed, too, but more was he angry. He noted the remnants of the uniforms upon the blacks and immediately he demanded to know where were their officers.

"They cannot understand you," said the girl and so in the bastard tongue that is the medium of communication between the Germans and the blacks of their colony, she repeated the white man's question.